相关实验视频

Updated: Jun 11, 2025

Evaluation of LC3-II Release via Extracellular Vesicles in Relation to the Accumulation of Intracellular LC3-positive Vesicles

Evaluation of LC3-II Release via Extracellular Vesicles in Relation to the Accumulation of Intracellular LC3-positive Vesicles

Published on: October 18, 2024

感染HTLV-1的T细胞会通过小的细胞外囊泡引起骨质损失

Nitin Kumar Pokhrel¹, Amanda R Panfil², Haniya Habib¹

¹Division of Bone & Mineral Diseases, Musculoskeletal Research Center, Washington University School of Medicine, Saint Louis, Missouri, USA.

Journal of extracellular vesicles

|October 10, 2024

概括

人类T淋巴细胞病毒1型 (HTLV-1) 感染T细胞会释放小细胞外囊泡 (sEV),通过刺激骨质细胞,独立于RANKL,导致骨质损失. 这种机制有助于成人T细胞白血病 (ATL) 的骨解性病变.

科学领域:

免疫学免疫学免疫学
在瘤学瘤学.
骨生物学骨生物学骨生物学

背景情况:

成人T细胞白血病 (ATL),由人类T淋巴细胞病毒1型 (HTLV-1) 引起,与骨并发症如高血症和骨解损伤有关.
感染HTLV-1细胞诱导骨再吸收的精确机制,特别是独立于RANKL,仍然不完全理解.

研究的目的:

研究HTLV-1感染的T细胞和骨质细胞之间的沟通在骨损失中介作用.
为了确定来自HTLV-1感染细胞的小细胞外囊泡 (sEV) 是否有助于骨解.

主要方法:

联合培养实验涉及患者衍生ATL细胞 (ATL-PDX) 和HTLV-1永生T细胞系 (HTLV/T) 与骨质细胞前体.
对无细胞超浮体和分离的sEV进行骨质细胞分化和骨再吸收活动的分析.
质谱学和电子显微镜用于表征sEV含量,包括病毒蛋白和骨相关因素.

主要成果:

来自ATL-PDX和HTLV/T细胞的超活体刺激了骨质细胞的形成,而来自高热血患者的ATL-PDX显示出更强烈的效果.
从HTLV/T和ATL-PDX细胞中分离的sEV携带了骨质细胞刺激活性,而从未感染的T细胞中分离的sEV没有.
活跃的sEV含有病毒Tax和Env蛋白质和参与骨质细胞形成的蛋白质,但缺乏RANKL和完整的病毒,表明一种新的骨解机制.

结论:

HTLV-1感染诱导T细胞释放具有强烈骨解活性的sEV,独立于RANKL.
这些sEV代表了HTLV-1感染改变骨微环境并导致骨破坏的关键机制,即使没有明显的白血病.

关键词:

成年人T细胞白血病细胞外囊泡中的细胞外囊泡.骨质结晶体的骨质细胞.骨质溶解是一种骨质裂变.蛋白质组学蛋白质组学

更多相关视频

Isolation And Dendritic Cell-Uptake of Small Extracellular Vesicles from Echinococcus granulosus

Isolation And Dendritic Cell-Uptake of Small Extracellular Vesicles from Echinococcus granulosus

Published on: March 28, 2025

Direct Stochastic Optical Reconstruction Microscopy of Extracellular Vesicles in Three Dimensions

Direct Stochastic Optical Reconstruction Microscopy of Extracellular Vesicles in Three Dimensions

Published on: August 26, 2021

相关概念视频

Intralumenal Vesicles and Multivesicular Bodies

Intralumenal Vesicles and Multivesicular Bodies

Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...

Receptor Downregulation in MVBs

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...